2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 140Get this manual
TROUBLESHOOTING
Situation Engine RPM below specified operating range, although engine is properly tunedProbable Cause -Wrong or broken drive clutch spring-Drive clutch shift weight too heavy-Driven clutch spring broken or installed in wrong helix locationRemedy -Replace with recommended spring-Install correct shift weight kit to match engine application-Replace spring; refer to proper installation location
Erratic engine -Drive clutch bindingoperating RPM during acceleration or load variations-Belt worn unevenlythinburnt spots -Driven clutch malfunction
aDisassemble drive clutch; inspect shift weights for wear and free operationbClean and polish stationary shaft hub; reassemble clutch without spring to determine problem areaReplace belt aReplace ramp buttonsbInspect movable sheave for excessive bushing clearance replace-Replace the clutch-Install correct recommended spring